Explanation
A preventive security measure is a measure that aims to prevent or deter potential incidents from occurring, or to reduce their likelihood or impact. A preventive security measure can be a policy, a procedure, a device, a technique or an action that reduces the exposure to threats and vulnerabilities. Storing sensitive information in a data safe is an example of a preventive security measure, because it protects the information from unauthorized access, disclosure, modification or destruction by physical means, such as theft, fire, flood, etc.
ISO/IEC 27001:2022 defines preventive control as "control that modifies risk by avoiding an unwanted incident" (see clause 3.19). References: [CQI & IRCA Certified ISO/IEC 27001:2022 Lead Auditor Training Course], ISO/IEC 27001:2022 Information technology - Security techniques - Information security management systems - Requirements, [What is Preventive Security?]